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Longman Dictionary of Contemporary English
four-wheel drive
noun
EXAMPLES FROM CORPUS
▪ Base price for the extended cab version with four-wheel drive is $ 21, 400.
▪ But clever suspension changes and, more important, the four-wheel drive, have tamed the beast.
▪ Cyril put the truck into four-wheel drive.
▪ Hire a four-wheel drive vehicle - there are lots of off-the-beaten-track spots to discover.
▪ She was an International Harvester Scout four-wheel drive.
▪ So why not fit four-wheel drive?
▪ Three teams in 1969 raced four-wheel drive - Lotus, Tyrrell-Matra and who was the third?
▪ Type: Front-engine, four-wheel drive, nine-passenger, full-size sport utility.
Wiktionary
four-wheel drive

n. A four-wheeled vehicle with a drivetrain that allows all four wheels to receive torque from the engine simultaneously.

WordNet
four-wheel drive
  1. n. a motor vehicle with a four-wheel drive transmission system [syn: 4WD]

  2. a transmission that provides power directly to all four wheels of a motor vehicle [syn: 4WD]

Wikipedia
Four-wheel drive

Four-wheel drive, 4×4 ("four by four"), and 4WD, is a form of drivetrain capable of providing power to all wheel ends of a two-axled vehicle simultaneously. It may be full-time, or on-demand, and is typically linked via a transfer case which provides an additional output drive-shaft, along with additional gear ranges.

A four-wheeled vehicle with power supplied to both axles may sometimes be described as "all-wheel drive" (AWD). However, "four-wheel drive" typically refers to a set of specific components and functions, and/or intended offroad application, which generally complies with modern use of the terminology.

Usage examples of "four-wheel drive".

Dale tried to estimate the age of the pickups and whether they had four-wheel drive.

I crunched down into low gear and went into four-wheel drive as the track snaked its way up the cliffs, doubling back on itself so often that I had a zany idea I might drive into my own rear.